Study of top quark pair production near threshold at the ILC

Horiguchi, T.; Ishikawa, A.; Suehara, Taikan; Fujii, Keisuke; Sumino, Y.; Kiyo, Y.; Yamamoto, H.

doi:10.48550/arxiv.1310.0563

Cited by 35 publications

(42 citation statements)

References 11 publications

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“…Remarkably, the allowed range of v R for N 1 DM and leptogenesis from N 2 is consistent with the observed top quark mass, m t = (172.76 ± 0.30) GeV. The parameter space can be further probed by the warmness of DM, precision measurements of the top quark mass and QCD coupling constant by future colliders 34,35,36,37,38 and lattice computations 39 , and measurement of the neutrino mass hierarchy.…”

Section: Standard Model Parameters and The Left-right Symmetry Breaki...supporting

confidence: 70%

Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Symmetric Theories

Dunsky¹,

Hall²,

Harigaya³

2021

Preprint

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Left-Right symmetric theories solve the strong CP problem and explain the small Higgs quartic coupling at high energy scales via the Higgs Parity mechanism, which forces the Higgs quartic coupling to vanish at the Left-Right symmetry breaking scale. They also predict three righthanded neutrinos; one may be stable and provide dark matter, and another may decay and explain the baryon asymmetry of the universe through leptogenesis. For the dark matter abundance to arise from freeze-out, the required range of the Left-Right symmetry breaking scale is 10 10 -10 13 GeV, in remarkable agreement with the energy scale at which the Higgs quartic coupling vanishes. The allowed parameter space can be probed by the warmness of dark matter, precise measurements of the top quark mass and QCD coupling constant by future colliders and lattice computations, and measurement of the neutrino mass hierarchy.

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Section: Standard Model Parameters and The Left-right Symmetry Breaki...supporting

confidence: 70%

Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Symmetric Theories

Dunsky¹,

Hall²,

Harigaya³

2021

Preprint

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“…As mentioned above, study [4] considered two-parameter fits to the threshold scan data only. This is also the case for earlier studies [18,19], while simultaneous fit of four model parameters was previously considered in [20]. Presented approach, thanks to its simple, semi-analytical form, allows to perform fits with even more free model parameters.…”

Section: Comparison Of Fit Configurationsmentioning

confidence: 73%

Optimising top-quark threshold scan at CLIC using genetic algorithm

Nowak,

Zarnecki

2021

Preprint

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One of the important goals at the future e + e − colliders is to measure the topquark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurement is a subject to many systematic uncertainties. Presented in this work is the study of the top-quark mass determination from the threshold scan at CLIC. The most general approach is used with all relevant model parameters and selected systematic uncertainties included in the fit procedure. Expected constraints from other measurements are also taken into account. It is demonstrated that the top-quark mass can be extracted with precision of the order of 30 to 40 MeV, including considered systematic uncertainties, already for 100 fb −1 of data collected at the threshold. Additional improvement is possible, if the running scenario is optimised. With the optimisation procedure based on the genetic algorithm the statistical uncertainty of the mass measurement can be reduced by about 20-30%. Influence of the collider luminosity spectra on the expected precision of the measurement is also studied.

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“…This discrepancy, however, is not so problematic [29,42], because the experimental value is derived as an invariant mass for the final states of color singlets to fit data while M t in the above calculation of the RGEs is the pole mass. There might be a few GeV discrepancy between the singlet final state and the color octet t t pair, which is dominant at the hadron collider [43]. That said, it is also possible to have successful RK Higgs inflation for the top quark mass close to the experimental central value, by introducing other particles such as a singlet scalar dark matter with a TeV mass and heavy right-handed neutrinos.…”

Section: Discussionmentioning

confidence: 99%

Renormalization group improved Higgs inflation with a running kinetic term

Takahashi

2016

Physics Letters B

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We study a Higgs inflation model with a running kinetic term, taking account of the renormalization group evolution of relevant coupling constants. Specifically we study two types of the running kinetic Higgs inflation, where the inflaton potential is given by the quadratic or linear term potential in a frame where the Higgs field is canonically normalized. We solve the renormalization group equations at two-loop level and calculate the scalar spectral index and the tensor-to-scalar ratio. We find that, even if the renormalization group effects are included, the quadratic inflation is ruled out by the CMB observations, while the linear one is still allowed.

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Study of top quark pair production near threshold at the ILC

Cited by 35 publications

References 11 publications

Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Symmetric Theories

Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Symmetric Theories

Optimising top-quark threshold scan at CLIC using genetic algorithm

Renormalization group improved Higgs inflation with a running kinetic term

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